Allows me to use AA batteries to power my kids toys that need D size batteries. Construction seems good. the plastic tab that keeps the cap in place seems that it will break at some point, I opened and closed them severeal times and they did not break yet, but i don't fully trust them,

Can use AA batteries for D size and no need to buy D size batteries anymore. It is especially good to use AA size rechargeable batteries since D size it is hard to find the battery and the charger. This one is also great to contain 2 batteries so that you can have twice the capacity.

In the past D batteries were very commonly used, but nowadays they are very expensive, to the point where filling an old toy with D batteries can lead you to bankruptcy ;-) This great product is an "adapter" which "converts" two AA batteries into one D battery. Excellent because AA batteries are...In the past D batteries were very commonly used, but nowadays they are very expensive, to the point where filling an old toy with D batteries can lead you to bankruptcy ;-) This great product is an "adapter" which "converts" two AA batteries into one D battery. Excellent because AA batteries are very cheap (especially if you have rechargeable ones). The resulting "battery" will not last as long as a real D battery (which often holds charge 6 times larger than that of one AA battery), but in most applications this doesn't matter.Read more

Great for using rechargeable AA batteries in devices that require D cell. Capacity of 2 AA batteries may not be quite as good as 1 alkaline D cell, but they still last quite long (and rechargeable AA NiMH capacities are increasing). I've used these converters for 2 years in a half-dozen devices I...Great for using rechargeable AA batteries in devices that require D cell. Capacity of 2 AA batteries may not be quite as good as 1 alkaline D cell, but they still last quite long (and rechargeable AA NiMH capacities are increasing). I've used these converters for 2 years in a half-dozen devices from flashlights to baby swings. They work in EVERY device I've tried and I LOVE the fact that I can keep 1 kind of battery (AA NiMH) for ALL devices...and I can recharge the AA batteries with my solar panel. I really have no complaints with these. They have proven durable (no broken hinges or anything), easy to use, and fit all devices perfectly. You will have to admit a minor loss in battery lifespan over a regular alkaline D cell, but it's not a major difference. My baby swing lasted 3 months on 4 D cells (8 AAs). Read more

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